Question

我有一个以下列格式加载到sqlite中的表：

player1 player2 player1Probability player2Probability
John    Peter   0.6                0.4
Peter   John    0.4                0.6
Mary    Bob     0.8                0.2
Bob     Mary    0.2                0.8

如您所见，不同列中存在重复项。前两行在它们提供的数据中基本相同：我们可以看到约翰有0.6概率，彼得从第一行有0.4，而第二行只是重复这些信息。

有没有办法通过SQL查询删除重复的行？

Answer 1

这就是我在MySQL中的做法，我希望在sqlite中可以这样做。

DELETE t1.*
FROM YourTable AS t1
JOIN YourTable AS t2 
ON t1.player1 = t2.player2 
    AND t1.player2 = t2.player1 
    AND t1.player1 > t1.player2

另一种方式：

DELETE FROM YourTable AS t1
WHERE EXISTS (SELECT *
              FROM YourTable AS t2
              WHERE t1.player1 = t2.player2
                 AND t1.player2 = t1.player1
                 AND t2.player1 < t1.player2)

SQL：删除列之间的重复行

1 个答案: